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        <h1 id="ControllerAdvice注解"><a href="#ControllerAdvice注解" class="headerlink" title="@ControllerAdvice注解"></a>@ControllerAdvice注解</h1><p>顾名思义，就是@ControllerAdvice的增强版，主要用于处理全局数据。</p>
<span id="more"></span>
<h2 id="用法1-结合-ExceptionHandler定义全局异常捕获机制"><a href="#用法1-结合-ExceptionHandler定义全局异常捕获机制" class="headerlink" title="用法1 :结合@ExceptionHandler定义全局异常捕获机制"></a>用法1 :结合@ExceptionHandler定义全局异常捕获机制</h2><h2 id="用法2：结合-InitBinder实现请求参数预处理"><a href="#用法2：结合-InitBinder实现请求参数预处理" class="headerlink" title="用法2：结合@InitBinder实现请求参数预处理"></a>用法2：结合@InitBinder实现请求参数预处理</h2><h3 id="InitBinder："><a href="#InitBinder：" class="headerlink" title="@InitBinder："></a>@InitBinder：</h3><p>　@InitBinder用于在控制器(Controller)中标注于方法上，表示为当前控制器注册一个属性编辑器，只对当前的Controller有效。@InitBinder标注的方法必须有一个参数WebDataBinder。webDataBinder是用于表单到方法的数据绑定的。所谓的属性编辑器可以理解就是帮助我们完成参数绑定。 </p>
<h3 id="示例："><a href="#示例：" class="headerlink" title="示例："></a>示例：</h3><p>假设现在有两个实体：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Data</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Book</span> </span>&#123;</span><br><span class="line">    <span class="keyword">private</span> String name;</span><br><span class="line">    <span class="keyword">private</span> String description;</span><br><span class="line">    <span class="keyword">double</span> price;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="meta">@Data</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Author</span> </span>&#123;</span><br><span class="line">    <span class="keyword">private</span> String name;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> age;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>在RestController层定义方法如下：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@GetMapping(&quot;/getbook&quot;)</span></span><br><span class="line">   <span class="function"><span class="keyword">public</span> String <span class="title">getBook</span><span class="params">(Book book,Author author)</span></span>&#123;</span><br><span class="line">       <span class="keyword">return</span> book.toString()+<span class="string">&quot;&gt;&gt;&gt;&quot;</span>+author.toString();</span><br><span class="line">   &#125;</span><br></pre></td></tr></table></figure><br>如果不处理book的name和author的name同名的问题，则：<br><img src="1.jpg" alt=""></p>
<h4 id="解决方案："><a href="#解决方案：" class="headerlink" title="解决方案："></a>解决方案：</h4><ol>
<li>在controller中添加@ModelAttribute注解<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@GetMapping(&quot;/getbook&quot;)</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">getBook</span><span class="params">(<span class="meta">@ModelAttribute(&quot;a&quot;)</span>Book book,<span class="meta">@ModelAttribute(&quot;b&quot;)</span>Author author)</span></span>&#123;</span><br><span class="line">        <span class="keyword">return</span> book.toString()+<span class="string">&quot;&gt;&gt;&gt;&quot;</span>+author.toString();</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure></li>
<li>配置@ControllerAdvice<br>注意是全局的<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@ControllerAdvice</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">GlobalConfig</span> </span>&#123;</span><br><span class="line">    <span class="meta">@InitBinder(&quot;b&quot;)</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">(WebDataBinder binder)</span></span>&#123;</span><br><span class="line">        binder.setFieldDefaultPrefix(<span class="string">&quot;b.&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="meta">@InitBinder(&quot;a&quot;)</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init2</span><span class="params">(WebDataBinder binder)</span></span>&#123;</span><br><span class="line">        binder.setFieldDefaultPrefix(<span class="string">&quot;a.&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<strong>解释</strong>：</li>
</ol>
<ul>
<li>@InitBinder(“b”)用于处理@ModelAttribute(“b”)</li>
<li>@InitBinder(“a”)用于处理@ModelAttribute(“a”)</li>
</ul>
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          <div class="post-toc motion-element"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#ControllerAdvice%E6%B3%A8%E8%A7%A3"><span class="nav-number">1.</span> <span class="nav-text">@ControllerAdvice注解</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#%E7%94%A8%E6%B3%951-%E7%BB%93%E5%90%88-ExceptionHandler%E5%AE%9A%E4%B9%89%E5%85%A8%E5%B1%80%E5%BC%82%E5%B8%B8%E6%8D%95%E8%8E%B7%E6%9C%BA%E5%88%B6"><span class="nav-number">1.1.</span> <span class="nav-text">用法1 :结合@ExceptionHandler定义全局异常捕获机制</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#%E7%94%A8%E6%B3%952%EF%BC%9A%E7%BB%93%E5%90%88-InitBinder%E5%AE%9E%E7%8E%B0%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%E9%A2%84%E5%A4%84%E7%90%86"><span class="nav-number">1.2.</span> <span class="nav-text">用法2：结合@InitBinder实现请求参数预处理</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#InitBinder%EF%BC%9A"><span class="nav-number">1.2.1.</span> <span class="nav-text">@InitBinder：</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#%E7%A4%BA%E4%BE%8B%EF%BC%9A"><span class="nav-number">1.2.2.</span> <span class="nav-text">示例：</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88%EF%BC%9A"><span class="nav-number">1.2.2.1.</span> <span class="nav-text">解决方案：</span></a></li></ol></li></ol></li></ol></li></ol></div>
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